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    <title>Math绝对值和两个取值方法</title>
    <script>
        // 1.绝对值方法  Math.abs
        console.log(Math.abs(1)); //1
        console.log(Math.abs(-1)); //1
        console.log(Math.abs('-1')); //隐式转换 会把字符串型 -1 转换为数字型
        console.log('pink'); // NaN

        //2.三个取整的方法
        // (1)Math.floor() 地板 向下取整  往小里取值
        console.log(Math.floor(1.1)); //1
        console.log(Math.floor(1.9)); //1

        // (2)Math.ceil() ceil 天花板  向上取整  往最大取值
        console.log(Math.ceil(1.1)); //2
        console.log(Math.ceil(1.5)); //2
        console.log(Math.ceil(1.9)); //2

        //(3)Math.round  四舍五入  其他数字都是四舍五入  都是 .5 特殊 它往大了取
        console.log(Math.round(1.1)); //1
        console.log(Math.round(1.5)); //2
        console.log(Math.round(1.9)); //2
        console.log(Math.round(-1.1)); //-1
        console.log(Math.round(-1.5)); //-1
    </script>
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